MIPS: Don't round up kernel sections size for memblock_add()

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[ Upstream commit d121f125af ]

Linux doesn't own the memory immediately after the kernel image. On Octeon
bootloader places a shared structure right close after the kernel _end,
refer to "struct cvmx_bootinfo *octeon_bootinfo" in cavium-octeon/setup.c.

If check_kernel_sections_mem() rounds the PFNs up, first memblock_alloc()
inside early_init_dt_alloc_memory_arch() <= device_tree_init() returns
memory block overlapping with the above octeon_bootinfo structure, which
is being overwritten afterwards.

Fixes: a94e4f24ec ("MIPS: init: Drop boot_mem_map")
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Alexander Sverdlin 2020-12-03 13:36:48 +01:00 • committed by Greg Kroah-Hartman

parent db4a90026e

commit a3164472e2

1 changed files with 2 additions and 2 deletions

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arch/mips/kernel/setup.c

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